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Title: TEM in-situ straining of B2 compounds

TEM in-situ straining of B2 compounds This paper reports preliminary observations of in-situ straining experiments performed using transmission electron microscopy on thin foils of the B2 compounds FeAl and NiAl, and of a two-phase B2/(f.c.c.)L1{sub 2} alloy containing a B2 phase Ni-30Al-20Fe. The first compound slips by movement of a/2{l angle}111{r angle} dislocation pairs, whereas the latter two exhibit {l angle}100{r angle} slip. NiAl and FeAl both showed intense dislocation activity ahead of growing cracks. In both cases, slip occurred in several places within the thin foils and not just ahead of the cracks. Slip in NiAl was wavy and the ease of cross slip was such that at higher strains a cell structure formed during in-situ straining. In contrast, FeAl showed planar slip in broad bands consisting of several parallel slip planes. Ni-30Al-20Fe also exhibited planar slip, but on individual planes not in bands. Dislocation pile-ups were also observed in the latter compound. 11 refs., 6 figs.
Authors: ; ; ;
Publication Date:
OSTI Identifier:5778871
Report Number(s):CONF-9106146-3
ON: DE91012062
DOE Contract Number:AC05-84OR21400; AC05-76OR00033
Resource Type:Conference
Data Type:
Resource Relation:Conference: 6. Japan Institute of Metals (JIM) international symposium on intermetallic compounds: structure and mechanical properties, Sendai (Japan), 17-20 Jun 1991
Research Org:Oak Ridge National Lab., TN (USA)
Sponsoring Org:DOE; USDOE, Washington, DC (USA)
Country of Publication:United States
Language:English
Subject: 36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; CRACK PROPAGATION; CRYSTAL DEFECTS; IRON ALLOYS; NICKEL BASE ALLOYS; FOILS; SLIP; STRAINS; TRANSMISSION ELECTRON MICROSCOPY; ALLOYS; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; MICROSCOPY; NICKEL ALLOYS 360102* -- Metals & Alloys-- Structure & Phase Studies; 360103 -- Metals & Alloys-- Mechanical Properties